feat: rename iOSDC Japan 2025 references to PHPerKaigi 2026

Replace all remaining references to the forked event name:
- Base path: /iosdc-japan/2025/code-battle/ → /phperkaigi/2026/code-battle/
- Display text and HTML titles
- CSS utility class: bg-iosdc-japan → bg-phperkaigi
- GitHub Actions submodule path: albatross-swift-2025 → albatross-php-2026

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

1 files changed, 5 insertions, 5 deletions

diff --git a/nginx.conf b/nginx.conf
index 11ac5ed..9e9248c 100644
--- a/nginx.conf
+++ b/nginx.conf
@@ -10,11 +10,11 @@ http {
 
     root /var/www;
 
-    location /iosdc-japan/2025/code-battle/files/ {
+    location /phperkaigi/2026/code-battle/files/ {
       alias /var/www/files/;
     }
 
-    location /iosdc-japan/2025/code-battle/api/ {
+    location /phperkaigi/2026/code-battle/api/ {
       proxy_pass http://api-server;
       proxy_set_header Host $host;
       proxy_set_header X-Real-IP $remote_addr;
@@ -22,7 +22,7 @@ http {
       proxy_set_header X-Forwarded-Proto $scheme;
     }
 
-    location /iosdc-japan/2025/code-battle/admin/ {
+    location /phperkaigi/2026/code-battle/admin/ {
       proxy_pass http://api-server;
       proxy_set_header Host $host;
       proxy_set_header X-Real-IP $remote_addr;
@@ -30,8 +30,8 @@ http {
       proxy_set_header X-Forwarded-Proto $scheme;
     }
 
-    location /iosdc-japan/2025/code-battle/ {
-      try_files $uri $uri/ /iosdc-japan/2025/code-battle/index.html;
+    location /phperkaigi/2026/code-battle/ {
+      try_files $uri $uri/ /phperkaigi/2026/code-battle/index.html;
     }
   }
 }